eh.. thanks so much. i have find some guides over at "help" click. i am designing jus a simple patch antenna will do for 3-5 Ghz. and i have calculated the width and height, but i not sure if it's good... can this program guides us on how to design? and i also have problem simulates, i save all the SONNET files in c drives, but when i want to analyse the project, it gives error code=2, i go the website and dunno what is the error about? it say ; ERROR: Cannot execute : "C:\PROGRA~1.51\\bin\\lmgrd.exe"-app-c"... and some other files. u know what error is that?